A UFO was videotaped by a passenger in a jet at very high altitude. The unidentified flying object streaks by at high speed, but a slowed down version of the video shows it doesn’t look like any known aircraft. What is it?

The video below, posted to YouTube, shows the view outside a passenger jet cabin window on a clear day. As the jet flies along, suddenly a streaking, white object zooms past below at high speed in the opposite direction.

The object doesn’t appear to have wings, it’s all white and doesn’t display navigational lights or any markings. Also, there doesn’t seem to be any exhaust at all coming from its tail.

The UFO cannot be a bird, as both aircraft are flying at high altitude, well beyond the reach of any winged creatures. A slow motion segment follows the real time sequence, but it doesn’t help to identify the strange, unknown object.